Voice OBD · Outbound dialing

Your message, heard by thousands in minutes.

Outbound voice calls with a recorded or text-to-speech message, in the language your audience speaks. Capture keypress replies, transfer interested callers to your team, and retry anyone who missed the call.

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campaigns / fee-reminder-oct

Audiofee_reminder_telugu.mp3 · 28 s

Keypress1 = Pay now · 2 = Talk to office

Press 1Payment link sent

Press 2Transferred to office

RetryUnanswered, after 2 hrs

Sample campaign screen

Recorded or TTSUpload audio or type the message

Indian languagesTelugu, Hindi, English and more

Keypress (DTMF)Capture replies during the call

Auto retriesCall back numbers that didn't answer

Use cases

When a message needs a voice.

Reminders

Payment and fee reminders

Remind customers and parents about due dates with an option to press 1 for a payment link.

Marketing

Voice campaigns

Announce offers, launches and events to opted-in customers in their own language.

Surveys

IVR surveys and feedback

Ask short questions and record answers by keypress, from CSAT scores to yes-or-no polls.

Verification

COD and order confirmation

Call customers to confirm orders and addresses before dispatch, with keypress confirmation.

Alerts

Emergency and service alerts

Power cuts, water supply, school closures or policy updates to large groups at once.

Leads

Interest capture and transfer

Interested listeners press a key to connect straight to your sales team.

Features

Everything a voice campaign needs.

Recorded audio or text-to-speech

Upload an MP3 or WAV, or type your message and choose a natural-sounding Indian voice.

Multilingual campaigns

Run the same campaign in Telugu, Hindi and English and send each contact the right language.

Keypress responses

Capture DTMF input during the call, such as press 1 to confirm, and trigger an SMS, WhatsApp or transfer.

Live call transfer

Connect interested listeners straight to an agent's phone or your call center queue.

Smart retries

Retry busy and unanswered numbers automatically at the intervals you choose.

Scheduling and throttling

Start at the right time and control calls per minute to match your team's capacity.

Compliance controls

Calling-hour limits, DND scrubbing for promotional calls and approved caller IDs.

Live reports

Answered, duration, keypress and transfer data for every number, downloadable anytime.

How it works

Launch a voice campaign in four steps.

Step 1
Create your message
Upload a recording or type a text-to-speech script in your chosen language.
Step 2
Add contacts
Upload an Excel or CSV list, or trigger calls from your CRM through the API.
Step 3
Set keypress and retries
Choose what each key does, how often to retry, and when calls can be made.
Step 4
Launch and track
Start the campaign and watch answered calls and keypresses update live.

Why it matters

Reach people who don't read messages.

Manual calling

A few hundred calls a day per caller
Message changes from one caller to the next
No record of who answered or what they said
Unanswered numbers forgotten

SparkNow Voice OBD

Thousands of calls in minutes
The same clear message every time, in the right language
Answer, duration and keypress logged for each number
Automatic retries for busy and unanswered numbers

Industries

How businesses use Voice OBD.

EducationFee reminders and admission announcements.See use cases →Banking & financeEMI reminders and policy renewals.See use cases →E-commerce & D2CCOD and address confirmation calls.See use cases →HealthcareVaccination drives and health camp invites.See use cases →

Developers

Trigger a voice call from your system.

Start one call or a whole campaign by API. Keypresses and call outcomes are posted back to your webhook.

Read the API overview

# Place an outbound voice call (sample request, full docs on sign-up)
curl -X POST https://api.sparknow.co.in/v1/voice/calls \
  -H "Authorization: Bearer $SPARKNOW_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+919800000000",
    "audio": "fee_reminder_telugu",
    "dtmf": { "1": "send_payment_link", "2": "transfer:office" },
    "retries": { "count": 2, "gap_minutes": 120 }
  }'

import { SparkNow } from "@sparknow/sdk";  // sample
const sn = new SparkNow(process.env.SPARKNOW_KEY);

const res = await sn.voice.call({
  to: "+919800000000",
  audio: "fee_reminder_telugu",
  dtmf: { 1: "send_payment_link", 2: "transfer:office" },
  retries: { count: 2, gapMinutes: 120 },
});
console.log(res.id, res.status);

import os
from sparknow import SparkNow  # sample
sn = SparkNow(os.environ["SPARKNOW_KEY"])

res = sn.voice.call(
    to="+919800000000",
    audio="fee_reminder_telugu",
    dtmf={"1": "send_payment_link", "2": "transfer:office"},
    retries={"count": 2, "gap_minutes": 120},
)
print(res.id, res.status)

FAQ

Questions, answered.

Still unsure? Ask Spark, our AI agent in the corner, or talk to our team.

What is Voice OBD?

OBD (outbound dialing) automatically calls a list of numbers and plays a recorded or text-to-speech message. Listeners can respond by pressing keys, and you see who answered and what they chose.

Can I use my own voice recording?

Yes. Upload an MP3 or WAV file, or use text-to-speech if you'd rather type the message. We can also help you record a professional message.

Which languages are supported?

Recordings can be in any language. Text-to-speech is available in English, Hindi, Telugu and several other Indian languages.

Are there rules for promotional calls?

Yes. Promotional calls must follow TRAI rules, including DND preferences and permitted calling hours, and use approved caller IDs. SparkNow applies these controls automatically.

How is Voice OBD charged?

Usually per pulse (for example, per 15 or 30 seconds) of answered call time. Book a demo for current rates.

Works well with

Combine channels for better reach.

Ready to spark every interaction?

See SparkNow on your own use case in a 20-minute demo, or ask our AI agent right now.